3940198447 has 2 divisors, whose sum is σ = 3940198448. Its totient is φ = 3940198446.

The previous prime is 3940198439. The next prime is 3940198453. The reversal of 3940198447 is 7448910493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3940198447 - 2³ = 3940198439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3940198447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3940198147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1970099223 + 1970099224.

It is an arithmetic number, because the mean of its divisors is an integer number (1970099224).

Almost surely, 2^3940198447 is an apocalyptic number.

3940198447 is a deficient number, since it is larger than the sum of its proper divisors (1).

3940198447 is an equidigital number, since it uses as much as digits as its factorization.

3940198447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 3940198447 is about 62771.0000477928. Note that the first 4 decimals coincide. The cubic root of 3940198447 is about 1579.4505442707.

The spelling of 3940198447 in words is "three billion, nine hundred forty million, one hundred ninety-eight thousand, four hundred forty-seven".